Grinding-mill.



PATENTED MAY 2, 1905,.

e. s. OUSHING. GRINDING MILL.

APPLICATION FILED NOV. 25, 1904.

4 SHEETS-8113M 1.

witnessgy Ggggg z' ifllnventor,

Attorneys G. S. GUSHING.

GRINDING MILL.

APPLICATION FILED NOV. 25, 1904.

PATENTED MAY 2, 1905.

4 SHEETS-SHEET 2.

Witnesses:

Gw/ycj. Chi/fizzy inventor,

Attorneys No. 788,634. PATENTED MAY 2, 1905.

G. s. GUSHING.

GRINDING MILL.

APPLICATION IIL ED NOV. 25, 19 04.

4 SHEETS SHEBT 3.

Witnesses: ventor,

Gm yefl Clea/15% In Attorneys No. 788,684. PATENTBD MAY 2, 1905.

' G. S. GUSHING.

GRINDING MILL.

APPLICATION rum) Nov;25,19o4.

'4 SHEETS-SHEET 4.

Witnesses: Inventor,

Attorneys Patented May 2, 1905.

PATENT OFFICE.

GEORGE SCAMMELL CUSHING, OF ST. JOHN, CANADA.

GRINDING-MILL.

SPECIFICATION forming part of Letters Patent No. 788,634, dated May 2, 1905.

Application filed November 25, 1904. Serial No. 234,202.

' such as will enable othersskilled in the artto whichitappertains to make and use the same.

My invention relates to grinding-mills specially adapted for use in grinding wood-pulp; and my invention has for its object to provide a grinding-null adapted to the production of pulp of a superior quality with a minimum expenditure of power.

The mill herein described is especially adapted for use upon small particles of wood, bark, sawdust, &c., which might otherwise go to waste, and has for its object especially the utilization of this refuse wood, which after its reduction to small chips is steamed in a suitable apparatus and thereafter deposited in the grinding-mill herein described, by the use of which a pulp is produced of iine quality and of heavy fibrous nature especially adapted for use in making paper or cardboard without the addition of other fibrous material.

In the accompanying drawings, forming a part of this application, in which 1 have illustrated one embodiment of my invention, similar reference characters designate corresponding parts.

Figure 1 is a side elevation of a grindingmill, certain parts being shown in section. Fig. 2 is a vertical section. Fig. 3 is an end elevation in the plane of line 5 5 of Fig. 1. Fig. 1 is a vertical section taken substantially on the line 6 6 of Fig. 6. Fig. 5 is a bottom plan of one of thegrinding-stones of the mill. Fig. 6 is a plan of the grinding-mill with its feed-hopper removed. Fig. 7 is a fragmentary detail in perspective. Fig. 8 is a fragmentary detail, in vertical section, taken on the line 10 10 of Fi 6; and Fig. 9 is a fragmentary View, in vertical section, through one of the grinding-stones of the mill and taken substantially on the line 11 11 of Fig. 5.

Referring to the drawings, the grindingmill is mounted upon a suitable frame 18 and comprises a stationary upper stone 19 and a lower rotatable stone 20, the latter being carried upon the upper extremity of a vertical shaft 21, driven by suitable gearing 22 and a belt-wheel 23, the latter part of this mechanism being carried in the lower portion of the frame, as shown. The grinding-stones 19 and 20 are preferably disposed at substantially the level of the floor 24, said floor being provided with a large opening about the stones, in which opening there is placed an annular cup or trough 25, which is adapted to receive the pulp from the periphery of the stones. This cup or trough may be inclosed in a suitable casing or frame 26. The lower stone 20 is preferably securely mounted in any suitable manner upon a baseplate 27, the same being securely attached to the upper extremity of the shaft 21, as will be readily understood. These stones are preferably of circular form and disposed a short distance apart, which distance is capable of being regulated in amanner which will appear more fully hereinafter. The upper stone 19 is attached, by means of suitable bolts 28, to the under side of a pair of oppositely-dis iiosed beams 29. As indicated most clearly in Fig. 8, these beams project beyond the periphery of the stones and near their extremities are provided with brackets 30, attached to their upper sides, which brackets overhang the edges of the beams, as shown, projecting toward a central line between the beams. The overhanging portion of these brackets constitute bearings 31, in Whiclreccentric shafts 32 are rotatably mounted. One of these shafts is most clearly shown in Fig. 9. It should be understood that the bearings 31 of the brackets 30 are double, and the eccentric shafts 32 at the points between the parts of the bearings 31 are formed with enlarged heads 33, and these heads 33 are rotatably mounted in the upper extremities of links 34, which links are pivotally attached at their lower extremities to base-plates 35, the said base-plates being attached to the floor 24, as shown. At one ex tremity these eccentric shafts 32 carry segments 36, rigidly mounted on said shafts, between which there is disposed at worm-shaft 37, comprising worms 38, which mesh, respectively, with these two segments, portions of this shaft 37 being rotatably mounted in bearings or brackets 39, attached to the eX- tremities of the beams 29, as shown. The projecting extremity of the worm-shaft 37 is provided with a suitable crank 40 for the purpose of rotating the worm-shaft and imparting a rotary movement to the eccentric shafts 32 by reason of the segments 36. Evidently such a rotation of the eccentric shafts would either raise or lower the upper stone 19, depending upon the position of the eccentric heads 33, as will be readily understood.

The upper stone 19 aforesaid is provided with a central opening 41, which may be of substantially square form, as shown, and above this opening there is disposed a hopper 42, of any suitable construction, adapted to receive the chips 13 from the digester, and over this hopper there is arranged a faucet or valve 43, enabling water to be supplied to the hopper through a pipe 44. It should be understood that the material to be ground passes from the hopper through the opening 41, and arriving upon the face of the lower stone 20 it is ground to a pulp at the same time that it moves progressively toward the periphery of the grinding-stones. In order to improve the efliciency of the actual grinding operation, the lower face of the upper stone is provided with a plurality of curved grooves or channels 45, preferably of the form shown in Fig. 11, and. which are of increasing depth toward the center of the stone, as will be readily understood. These grooves preferably curve forwardly with reference to the direction of rotation of the lower stone, which direction is indicated by an arrow at the right of Fig. 7. This arrangement operates to effect a feeding or progressive movement of the material toward the periphery of the stone. At the proper points the stone is provided with bolt-holes or openings 46, together with recesses 47, in which the heads of the bolts 28 may be countersunk.

In order to further facilitate the progressive or feeding movement of the material toward the periphery of the stones, just beneath the aforesaid opening 41 the upper face of the lower stone is provided with a feeder 48, which feeder is preferably of substantially the form shown most clearly in Figs. 8 and 10.

into the shape of a rudely-formed letter S, and this feeder is attached, by means of suitable screws 49, at the central portion of the It consists of a narrow plate or bar bent stone. This feeder is disposed so that its extremities incline toward the rear with reference to the direction of rotation of the stone, which direction is indicated by the arrow in Fig. 6, which is placed adjacent the feeder.

Having described my invention, what I claim, and desire to secure by Letters Patent,

1. In a grinding-machine for use in manufacturing wood-pulp, a pair of grinding members one of which is perforated, an annular trough approximately surrounding said grinding members, eccentric shafts connected with one of said grinding members, and means for rotating said shafts.

2. In a pulp-grinding machine, a non-rotatable grinding member, a rotatable grinding member therebelow, actuating means for said rotatable member, an annular trough approximately surrounding said grinding members, eccentric shafts connected with the non-rotatable grinding member, segments on said eccentric shafts, and worm-gearing adapted to actuate said segments.

3. In a pulp-grinding mill, a non-rotatable verticallyadjustable grinding member, eccentric shafts connected therewith, means for rocking said shafts, a rotatable grinding member below said adjustable grinding member, and an annular trough in convenient juxtaposition to said grinding members.

4. In a pulp-grinding machine, a supporting-frame, driving mechanism, a rotatable grinding member connected with said driving mechanism, an annular trough disposed below said grinding member and adjacent its periphery, a non-rotatable grinding member, and means for raising and lowering said .nonrotatable member.

5L In a pulp grinding mill, a rotatable grinding member, an annular trough in convenient juxtaposition thereto, a non-rotatable cooperating grinding member for furrows therein radiating from the central portion thereof and of less depth near their outer ends, eccentric shafts supported above said non rotatable member, segments on said shafts, a worm-shaft extending transversely of said eccentric shafts, and worms thereon in mesh with said segments.

In witness whereof I have hereunto set my hand in the presence of two witnesses.

GEORGE SCAMMELL CUSHING.

Witnesses:

G. D. PURDY, T. WV. GREGORY. 

